Open the Settings app
Tap Sound or Sounds and vibration
Tap Ringtone
Select a ringtone from the list
Tap Apply or Save if prompted
Open the Phone app if your device changes ringtone settings there
Tap the menu or More options
Go to Settings
Tap Calls or Ringtone
Choose your preferred ringtone
Confirm the selection
Set a custom ringtone by selecting a music file if supported
Save the changes
Test the ringtone by asking someone to call you or using a ringtone preview